The overall ratings of 10 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’s (YOKU) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Youku Tudou is an Internet television company. To get an in-depth look at YOKU, get Portfolio Grader’s complete analysis of YOKU stock.

Marchex, Inc. Class B (MCHX) is having a tough week. The company’s rating falls from a D to an F. 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. For more information, 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. To get an in-depth look at UPIP, get Portfolio Grader’s complete analysis of UPIP stock.

ChinaCache International Holdings Ltd. Sponsored ADR (CCIH) experiences a ratings drop this week, going from last week’s 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. Shares of the stock have been exchanging at an usually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of CCIH stock.

The rating of E2open, Inc. (EOPN) slips from a D to an F. 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.

This week, iPass (IPAS) drops from a D to an F rating. 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 (VELT) gets weaker ratings this week as last week’s D drops to an F. 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. For more information, get Portfolio Grader’s complete analysis of TZOO stock.

The rating of Homeaway, Inc. (AWAY) declines this week from a 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 225.00. To get an in-depth look at AWAY, get Portfolio Grader’s complete analysis of AWAY stock.

CoStar Group, Inc. (CSGP) earns a D this week, moving down from last week’s grade of C. 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 134.80. 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.