Six internet and web service stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

AOL’s (AOL) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). AOL provides online content, products, and services to consumers, publishers, and advertisers worldwide. The stock price has risen 12.4% over the past month, better than the 1.7% decrease the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of AOL stock.

This week, Constant Contact, Inc. (CTCT) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Constant Contact is a provider of on-demand email marketing and online survey solutions for small organizations, including small businesses, associations and non-profits. The stock’s price is $31.54 after four days of declining prices prices. For more information, get Portfolio Grader’s complete analysis of CTCT stock.

SPS Commerce, Inc. (SPSC) earns a B this week, jumping up from last week’s grade of C. SPS Commerce provides on-demand supply chain management solutions through an online hosted software suite. The stock price is $68.08 after recording five straight days of falling prices. For more information, get Portfolio Grader’s complete analysis of SPSC stock.

Google Inc. Class A (GOOG) improves from a C to a B rating this week. Google is a global technology company that provides web-based search and advertising services. The stock’s price of $1,160.10 is above the 50-day moving average of $1,084.31. For more information, get Portfolio Grader’s complete analysis of GOOG stock.

IAC/InterActiveCorp. (IACI) shows solid improvement this week. The company’s rating rises from a B to an A. IAC is an Internet company that reports revenue in search, personals, media & other areas. Investors seem to agree with the upgraded status of the stock and have pushed the stock up 5.7% over the past month. For more information, get Portfolio Grader’s complete analysis of IACI stock.

The rating of Jiayuan.com International Ltd. Sponsored ADR (DATE) moves up this week, rising from a C to a B. 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.