This week, the ratings of 14 internet and web service stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

QuinStreet, Inc.’s (QNST) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). QuinStreet specializes in vertical marketing and media on the Internet. In Portfolio Grader’s specific subcategories of Earnings Momentum, Earnings Revisions, Equity, Cash Flow and Sales Growth, QNST also gets F’s. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. To get an in-depth look at QNST, get Portfolio Grader’s complete analysis of QNST stock.

Unwired Planet, Inc. (UPIP) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Unwired Planet develops patents that allow mobile devices to connect to the Internet. The stock gets F’s in Earnings Revisions and Equity. Shares of the stock have been changing hands at an unusually rapid pace, up 721.7% from the week prior. For more information, get Portfolio Grader’s complete analysis of UPIP stock.

This is a rough week for Benefitfocus, Inc. (BNFT). The company’s rating falls to F from the previous week’s D. The stock also gets an F in Cash Flow. As of Feb. 5, 2015, 10.3% of outstanding Benefitfocus, Inc. shares were held short. Shares of the stock have been changing hands at an unusually rapid pace, four times the rate of the week prior. To get an in-depth look at BNFT, get Portfolio Grader’s complete analysis of BNFT stock.

The rating of eBay (EBAY) slips from a C to a D. eBay is a web-based consumer-to-consumer company in the online auction and shopping industry with operations localized in over thirty countries. The stock also gets an F in Margin Growth. For more information, get Portfolio Grader’s complete analysis of EBAY stock.

The rating of Web.com Group, Inc. (WWWW) declines this week from a D to an F. Web.com is a provider of Do-It-For-Me and Do-It-Yourself website building tools, online marketing, lead generation and technology solutions that enable small and medium-sized businesses to build and maintain an online presence. The stock also gets an F in Earnings Momentum. To get an in-depth look at WWWW, get Portfolio Grader’s complete analysis of WWWW stock.

Perficient, Inc. (PRFT) is having a tough week. The company’s rating falls from a C to a D. Perficient designs, develops, implements, and integrates secure and scalable enterprise portals for its clients and their customers, suppliers and partners. The stock currently has a trailing PE Ratio of 27.80. For more information, get Portfolio Grader’s complete analysis of PRFT stock.

SouFun Holdings Ltd Sponsored ADR Class A (SFUN) experiences a ratings drop this week, going from last week’s D to an F. SouFun Holdings operates a real estate Internet portal, and a home furnishing and improvement website in the People’’s Republic of China. The stock gets F’s in Earnings Momentum, Earnings Revisions and Earnings Surprise. To get an in-depth look at SFUN, get Portfolio Grader’s complete analysis of SFUN stock.

This week, Demand Media, Inc. (DMD) drops from a D to an F rating. Demand Media operates as a content and social media company in the United States that identifies, creates, distributes, and monetizes content. The stock gets F’s in Equity, Cash Flow and Sales Growth. For more information, get Portfolio Grader’s complete analysis of DMD stock.

Wix.com Ltd. (WIX) gets weaker ratings this week as last week’s C drops to a D. The stock also rates an F in Equity. To get an in-depth look at WIX, get Portfolio Grader’s complete analysis of WIX stock.

Slipping from a C to a D rating, LivePerson, Inc. (LPSN) takes a hit this week. LivePerson provides technology that facilitates real-time sales and customer service for companies doing business on the Internet. For more information, get Portfolio Grader’s complete analysis of LPSN stock.

This week, iPass’ (IPAS) rating worsens to an F from the company’s D rating a week ago. iPass offers enterprise mobility services on a global basis by providing services that simply, smartly and openly facilitate network access from mobile devices while providing the enterprise with visibility and control over their mobile ecosystem. In Earnings Revisions, Equity, Cash Flow and Sales Growth the stock gets F’s. To get an in-depth look at IPAS, get Portfolio Grader’s complete analysis of IPAS stock.

Velti (VELT) earns an F this week, moving down from last week’s grade of D. Velti is a global provider of mobile marketing and advertising solutions. The stock gets F’s in Earnings Growth and Earnings Momentum. For more information, get Portfolio Grader’s complete analysis of VELT stock.

This week, Zix Corporation’s (ZIXI) rating worsens to a D from the company’s C rating a week ago. Zix provides secure, Internet-based applications in a Software-as-a-Service (SaaS) model. The stock gets F’s in Earnings Growth and Earnings Momentum. The stock’s trailing PE Ratio is 27.30. To get an in-depth look at ZIXI, get Portfolio Grader’s complete analysis of ZIXI stock.

Jiayuan.com International Ltd. Sponsored ADR (DATE) earns a D this week, falling from last week’s grade of C. Jiayuan. com International is an online Chinese dating company. The stock receives F’s in Earnings Growth, Earnings Momentum and Earnings Revisions. Earnings Surprise and Margin Growth also get F’s. Shares of the stock are being traded at a very rapid pace, up 11586.2% from the week prior. For more information, get Portfolio Grader’s complete analysis of DATE stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.