Can I copy and paste eNotes summaries to other sites?
A much better options would be to rewrite the summary in your own words and then provide a link to the eNotes site. This would have several benefits for you. First, you would get credit from Yahoo for your contribution. Next, you would be providing original information to the members of the group. Finally, you would increase your total amount of original web content thereby possibly improving your Klout score.
One of the things you want to consider as you post things on the web is that in a few years potential employers will be using internet search engines when they evaluate you as a job candidate. Although they may not be interested in your knowledge of Victorian fiction, your name being associated with original, well researched content will make you seem a potential asset to any company.