The overall ratings of 11 internet and web service stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Youku Tudou, Inc. Sponsored ADR Class A (YOKU) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). Youku Tudou is an Internet television company. For more information, get Portfolio Grader’s complete analysis of YOKU stock.

This week, Marchex, Inc. Class B (MCHX) drops from a D to an F rating. Marchex offers call-based advertising and related services, pay-per-click advertising and related services and proprietary traffic sources. The stock gets F’s in Earnings Growth, Earnings Momentum and Earnings Surprise. Equity and Cash Flow also get F’s. To get an in-depth look at MCHX, get Portfolio Grader’s complete analysis of MCHX stock.

This week, Unwired Planet, Inc. (UPIP) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Unwired Planet develops patents that allow mobile devices to connect to the Internet. The stock gets F’s in Earnings Revisions and Equity. For more information, get Portfolio Grader’s complete analysis of UPIP stock.

This week, Borderfree, Inc.’s (BRDR) rating worsens to an F from the company’s D rating a week ago. The stock also gets an F in Earnings Growth. To get an in-depth look at BRDR, get Portfolio Grader’s complete analysis of BRDR stock.

The rating of ChinaCache International Holdings Ltd. Sponsored ADR (CCIH) slips from a C to a D. ChinaCache International provides a portfolio of services and solutions to businesses, government agencies and other enterprises to enhance the reliability and scalability of their online services and applications and improve end-user experience. For more information, get Portfolio Grader’s complete analysis of CCIH stock.

E2open, Inc. (EOPN) earns an F this week, moving down from last week’s grade of D. E2open develops and deploys enterprise software cloud solutions for businesses. The stock gets F’s in Equity and Cash Flow. To get an in-depth look at EOPN, get Portfolio Grader’s complete analysis of EOPN stock.

iPass (IPAS) earns an F this week, falling from last week’s grade of D. 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. The stock gets F’s in Earnings Revisions, Equity, Cash Flow and Sales Growth. For more information, get Portfolio Grader’s complete analysis of IPAS stock.

Velti’s (VELT) rating weakens this week, dropping to an F versus last week’s D. Velti is a global provider of mobile marketing and advertising solutions. The stock gets F’s in Earnings Growth and Earnings Momentum. To get an in-depth look at VELT, get Portfolio Grader’s complete analysis of VELT stock.

Travelzoo (TZOO) is having a tough week. The company’s rating falls from a D to an F. Travelzoo is an Internet media company that publishes travel and entertainment deals from travel and entertainment companies, and local businesses in North America, Europe, and the Asia Pacific. The stock gets F’s in Earnings Growth, Earnings Revisions and Sales Growth. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of TZOO stock.

Homeaway, Inc. (AWAY) experiences a ratings drop this week, going from last week’s D to an F. HomeAway operates an online marketplace for the vacation rental industry worldwide, and offers homes, condominiums, villas, and cabins to the public on a nightly, weekly, or monthly basis. The stock gets F’s in Earnings Growth and Margin Growth. The stock currently has a trailing PE Ratio of 213.10. To get an in-depth look at AWAY, get Portfolio Grader’s complete analysis of AWAY stock.

The rating of CoStar Group, Inc. (CSGP) declines this week from a C to a D. CoStar provides information and analytic services to the commercial real estate industry in the United States, the United Kingdom, and France. The stock also gets an F in Earnings Momentum. The stock’s trailing PE Ratio is 135.40. For more information, get Portfolio Grader’s complete analysis of CSGP 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.