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Links that are added in the "Website" field in a twitter profile are nofollow. However, links added to the "Bio" section are dofollow. This has to mean these links are passing juice correct?

I made some changes to title tags on a clients site over a month ago. Google has since crawled all the pages that the changes were made to. Here's the problem. For some of the pages, the old title is still showing in search results. Why does Google do this? 2) What can I do about it?

I'm assuming the rel="bookmark" tag doesn't have any SEO implications but I just wanted to make sure it wasn't viewed like a nofollow by search engines.

Is it worth going to the trouble to contact webmasters in person by phone rather than just using email? If so, what has been your approach to link building by phone?

From your experience, what have you found to be the most effective method for link building? It's starting to look like the only way to receive good links is by writing great content or offering great services and allowing the links to come in naturally (which is obviously the most important thing anway), but are there still any effective methods of getting valuable links through link building, apart from having personal connections and relationships with site owners?