Here's a neat infographic from TagMan demonstrating the impact social media plug-ins can have on purchasing.
It's self-explanatory really but questions why travel sites are not more socially connected.
TagMan, which incidentally unveiled a new version of its tag solution last summer aimed at improving website performance, says every tag adds about 100 miliseconds to the download speed with a resulting loss in conversion.
The company has also blogged on the issue of website speed and conversion loss with some interesting comments at the bottom of the piece on whether slower pages actually caused people to convert less.