While the original "ShareThatBoy" movement started with user-generated art and music, the term has been co-opted over time. If the +link points to copyrighted material (movies, software, TV shows), clicking it and downloading it exposes you to DMCA violations and potential legal notices from your ISP.
When a user searches for sharethatboy+link, they are not looking for discussion about the content; they are looking for the raw, unmuddled URL. The "+link" tells the search engine or forum filter: "Skip the commentary. Deliver the destination." sharethatboy+link
A concise how-to for creating and sharing a "sharethatboy+link" (assumed: a short, trackable share link for a profile, post, or content). If you meant something else, specify. they are looking for the raw