Web tracker Experian Hitwise reports a decline in web visits to daily deals websites Groupon and LivingSocial. Three online research companies Experian Hitwise, Compete and ComScore reveal the steady drops in traffic for both websites, due to new competing sites entering the market.

The mobile-optimized Google +1 button has now made its debut on select Android and iPhone browsers. The +1 button ties directly into Google’s social network such that when used, it is publicly displayed across the Web.

With the recent riots spreading across London, Twitter has seen an enormous uptake in traffic among British online users. Experian Hitwise reports within the three days of violence, UK visits to Twitter were so frequent that a new all-time record was set.

A report from Experian Hitwise finds both traffic and users’ average time on the social network Google+, fell last week in the U.S. The report comes after Google+’s traffic enjoyed a steady climb since its June 28, 2011 debut.