A few weeks ago I discovered the (mostly American) subreddits for lawyers.

The /r/LegalMarketing subreddit is particularly useful for solo lawyers. Here's a post from yesterday that details one lawyer's web marketing efforts: reddit.com/....

/r/lawfirm has practical tips on how to run a practice. Here's a recent thread on "What is the best kind of debt to buy in collections".

/r/law is more of an "enthusiast" subreddit and not nearly as useful for building your practice.