It's a well known fact that celebs like to keep their fans constantly up to date with their shenanigans via Twitter, however it seems that the One Direction boys like to use the social networking site for something else as well – finding 'potential girlfriends.'

You may think that being a member of 1Direction automatically sends millions of girls throwing themselves at you and you're probably correct majority of the time. However, the boys like to 'check out girls to help determine if they're serious dating material' by checking their Twitter profile before pursuing anything serious, it seems.

Niall Horan‘s brother Greg tells Heat Magazine: “They test out girls to make sure they are trustworthy”. He then added: “[Niall] will follow you on Twitter for a while and suss you out, make sure you’re genuine and have you out – then go for it.”

Greg says it saves the boys' time: “[Niall] has a lot of female friends that he goes out with, but he’s not going to start seeing them seriously because he doesn’t have the time.” Greg also adds advice for any girls hoping to be Niall’s future girlfriend: “…Watch what you’re saying on Twitter. Make sure you’re coming across as genuine.”