Categorising online marketing activities

[Receptional Andy]

If pay per click listings are a subset of online advertising, what is search engine optimisation a subset of?

Or if paid search is search engine marketing, then does that mean it isn't online advertising?

And what's online public relations? Social networking?

Someone help me clear my head, please! ;)

[Marcia]

Isn't it all internet marketing?

[coopster]

Looks like you've been reading through online directories or something lately :)