Cofounder here, thanks for your feedback! This is indeed an early version, and to answer your points more precisely:

- This is indeed planned, and as you can see in the comments you're not the only one thinking that! It cannot be done with a bookmarklet but we will release Chrome and Firefox extensions that will have this feature.

- I don't get what you mean by "something sidebar-like", are you talking of a pannel on the top of your screen automatically displaying the summary if it exists?

- Yep, building an active community around tldr.io will likely be key to its success. We are thinking hard on how to do it, and if you have any ideas or suggestion they are more than welcome

Forget about the sidebar. I thought it was a good idea , but it isn't.

Regarding the community, It wasn't in the line of "building a community as a key to success" but rather give profiles some more strength, use something karma-like to reward users who work, the ability to score TL;DRs and allow multiple per page, etc.

Yep, that is definitely planned. Especially a karma-like system to reward users who work. Since you're helping people by providing tldrs, we are thinking about the count of people who read tldrs you created, meaning the number of people you helped.