From what I can see tags are pre-populated. If that is how it works I suggest that be changed.
I expect them to work like hashtags so that community created tags can gain traction #unite8 :D :D
It will be limited for the time being as we get geared up. Let us know what you'd like to see.
@NianticMac suggestions :D
XMAnomaly, Anomaly, Mission Day, NL-1331, IngressFS, EmbeddedReporter, Swag, Resistance, Enlightened, GlyphChallenge, SitRep, IngressStories, MoreThanAGame. Just to name a few ;D
@NianticMac love it :D