Timehop was an app that would scrape your social media and "remind" you of anniversaries at a later date.
As such, it had to have permission to access your social media.
An app asks for full access to resources during installation --- which I may not grant unless I see them as necessary. If installation continues & the app runs without these, well and good.
An app fails to install unless I grant access, in which case I'll give it access during installation, but revoke the permissions in the security settings immediately after. If the app still runs after that, well and good.
An app fails to run after I revoke permissions in the security settings, unless I again grant access. At this point I'll decide on whether I can do without the app.