The web metrics firm revealed that during May social networks accounted for 11.88 percent of all UK internet visit, while search engines made up 11.33 percent.
Experian Hitwise said Facebook was the most popular social network with Brits, accounting for 55 percent of all UK internet visit to a social network, almost three times as many as the next most popular social network, YouTube.
Twitter was the third most popular social network in the UK.
Despite its popularity, Facebook didn't manage to topple Google when it comes to the most visited website in the UK. During May, Google UK accounted for 9.29 percent of all UK web visits.
Facebook was the second most visited website in the UK and accounted for 7.04 percent of all UK web visits in the same month.
"Social networks are a key part of the online landscape in the UK, and their popularity continues to grow," said Robin Goad, research director for Experian Hitwise.
"Although social networks and search engines perform different functions, they both act as gateways to the wider internet. This data perfectly illustrates the key role that social media now plays in so much online behaviour."
See also: Facebook won't overtake Google in UK