Taking selfies with other sims gives a massive amount of friendship points.
No idea if this is a bug or not, also not sure if this is where I should post this (these forums are confusing) but using the "take photo with" action twice and taking 10 photos with a sim gets me alm...
Glad I'm not the only one experiencing this. Guess the days of cloud gazing for hours to make friends is behind us! Just snap a few photos together and they'll take a bullet for us.