Great article with some interesting points! Hope to see more stuffs like this.
You mentioned limiting the profile summary such that the 'Show more' link does not appear. What are your opinions of writing summaries in such way that the key important stuff is there on first glance, before the 'Show more' link, but also if someone actually wants to read more, he can click on 'Show more' and read more?
The reason I discouraged to put more is that most people will use that Show More as dumping grounds for content. So you can take advantage of this space but I think most people will not have the writing skills based on what I've seen so far.
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