Facebook are downgrading check-ins while Foursquare are upgrading its check-in options. Also this week, Jumo has been acquired by GOOD and we donate in our sleep.

We take a look at two new start ups, witness round two of Google and Facebook’s tussle for control of the web and round up how this half a year has impacted some of the biggest sites.

Foursquare had a record day, Google adds social gaming to its repertoire and releases Google Analytics V5. YouTube follows suit with upgraded analytics and Facebook launches a rival to Groupon and LivingSocial.

Twitter launched UK office, looks to buy Tweetdeck. Everything Everywhere waives text donation fees and Marks and Spencer rewards Foursquare check-ins with charity donations.

This week: How social media is doing its bit to help Japan, what sites are best for your ad placements, Facebook Places impact on Foursquare and Microsoft releases Internet Explorer 9.

This week: How much does a Facebook fan cost, and how much are they worth? Also, Valentine’s Day activity on Twitter and a treat from NFPtweetup!

After last weeks double serving, here’s this weeks equally fattening portion of beautiful bytes.

The following article from Mashable (via @meanwritehook – thank you for sharing!) interested me, since it not only shows a company using Foursquare to increase sales, but also shares the results – which is the bit we all want to know about.

Over the last week, I don’t think there has been a day go by without someone in the office, or online, mentioning mobile marketing.

Another week, another beautiful bytes round up of what’s hot in technology and charity.