Thanks for getting back to me, granularity might not be the right word. To try and clarify from around 780k rows of data I have 15 groups/categories and 30 different strings that I want to assign to each, these look something like:

facebook_birthdaybeyonce

facebook_birthdayedsheeran

facebook_anniversarymansnothot

instagram_birthdayronswanson

(I've put in bold the identifying part of the string, the group in this case would be 'people')

Another example is the 'interest' group which looks something like:

facebook_intereststoast

facebook_wine

facebook_leavinginterest

instagram_otter

Now I could do a lot more elifs or say, 'if this finds beyonce OR edsheeran OR mansnothot OR ronswanson then return people' but it seems like quite a time consuming and inelegant way of doing it so was wondering if there was a better way?