This week, six internet and web service stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

Commtouch Software Ltd’s (CTCH) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Commtouch Software provides messaging, antivirus, and Web security solutions to OEM customers, enterprises, and service providers primarily in Israel, North America, Europe, and Asia. In Portfolio Grader’s specific subcategory of Sales Growth, CTCH also gets an A. For more information, get Portfolio Grader’s complete analysis of CTCH stock.

Akamai Technologies, Inc. (AKAM) gets a higher grade this week, advancing from a C last week to a B. Akamai Technologies provides services for accelerating and improving the delivery of content and applications over the Internet. The stock price has risen 5.7% over the past month, better than the 1.3% decrease the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of AKAM stock.

This is a strong week for IntraLinks Holdings, Inc. (IL). The company’s rating climbs to B from the previous week’s C. IntraLinks Holdings provides Software-as-a-Service solutions for managing content, exchanging business information and collaborating within and among organizations. Wall Street seems to agree with the upgrade and has propelled the stock up 5.4% over the past month. 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 IL stock.

This week, Sohu.com, Inc.’s (SOHU) ratings are up from a C last week to a B. Sohu.com is an Internet media company that serves as a daily source of information, communication and entertainment for millions of Chinese consumers. Investors have pushed the stock price up 8.7% over the past month. For more information, get Portfolio Grader’s complete analysis of SOHU stock.

OpenTable, Inc. (OPEN) shows solid improvement this week. The company’s rating rises from a C to a B. OpenTable provides free, real-time online restaurant reservations for diners through an online booking service. Investors seem to agree with the upgraded status of the stock and have pushed the stock up 8.8% over the past month. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of OPEN stock.

Jiayuan.com International Ltd. Sponsored ADR (DATE) improves from a C to a B rating this week. Jiayuan. com International is an online Chinese dating company. 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.