That depends on what your threat model is. I assume we're talking about random police or border searches of your phone. Not the NSA or some surveillance apparatus which can make warrantless inquiries to your ISP and social network providers at a moments notice.
If we're facing a surveillance state without any internal obstructions then yes, far stricter opsec will be needed.
In the near future I expect random border searches to include all internet traffic associated with you. It's going to get hard for the average person to evade it. Your techniques won't be nearly enough.
I guess I'm wondering if border guards at any point in the future will have quick access to a database, presumably with information from a company that has either voluntarily or been forced to provide data.
Sir, we just ran your social networking accounts and according to our data you have another Facebook account that you did not provide access to...
Such a database would indicate two things a) law enforcement has access to such a database without warrants b) facebook provides such a database without warrants.
To me those would be reasons to leave the country and facebook.
If we're facing a surveillance state without any internal obstructions then yes, far stricter opsec will be needed.