"Although you retain any proprietary rights that you may have in and to your Content, once you post your Content to the Site, you hereby grant ActiveRain, its affiliated companies, and their respective successors and assigns, a worldwide, non-exclusive, sub-licensable (through multiple tiers) right and license...."
"The foregoing license granted by you terminates once you remove or delete your Content from the Site....ActiveRain will make commercially reasonable efforts to take down links, frames, and other work or content within its control that may be associated with your Content..."
"Unless otherwise agreed in a writing signed by HomeGain, by submitting content, photos, video, data or other materials directly through the HomeGain web site (collectively, "Materials"), you hereby grant to HomeGain a perpetual, irrevocable, royalty-free, non-exclusive, fully transferable and sublicensable right and license to access, store, copy, modify, display, distribute, perform, create derivative works from, and otherwise use and exploit all such Materials in any form, media, software or technology of any kind now existing or developed in the future and the right to sublicense the foregoing rights through multiple tiers. You further grant to HomeGain a royalty-free right and license to use your name, image and likeness in advertising and in connection with the licensed rights for the Materials."
You expressly agree that HomeGain: ...(b) reserve the right to review, reject, delete, remove, modify, or edit any Materials at any time for any reason, without liability and without notice to you.
Automattic has the right (though not the obligation) to, in Automattic’s sole discretion (i) refuse or remove any content that, in Automattic’s reasonable opinion, violates any Automattic policy or is in any way harmful or objectionable, or (ii) terminate or deny access to and use of the Website to any individual or entity for any reason, in Automattic’s sole discretion. Automattic will have no obligation to provide a refund of any amounts previously paid.
Automattic may terminate your access to all or any part of the Website at any time, with or without cause, with or without notice, effective immediately.
3. Materials You Provide; Account Use; Privacy.
...You grant Zillow.com an irrevocable, perpetual, worldwide license to (1) use, copy, distribute, transmit, publicly display, publicly perform, reproduce, edit, modify, and translate your Submission, in connection with the Services or in any other media, and (2) sublicense these rights, to the maximum extent permitted by applicable law. Zillow.com will not pay you for your Submission. Zillow.com may remove your Submission at any time
11. Changes; Discontinuance.
User Submitted Content
...You are solely responsible for any Content and other material that you submit, publish, display or link to on the Site or send to other Trulia users.
You agree that by posting content on the Site, you are granting Trulia a royalty-free, perpetual, irrevocable license to use this information in the course of offering the Services.
I'll stop the citations here but you can be sure that similar language is found on every similar type site and/or service.
If you don't want your content used by anyone but yourself, don't contribute anywhere: Use an independent web publishing platform, host the software yourself, scrub the web for content scrappers...and good luck getting found.
Personally Ive found that the bigger you give, the bigger you get...the laws of reciprocity still work pretty well. Participating on, or at least checking out, any and all of the above sites will yield some upside in the form of education and possibly business.
In the end, you have to trust the venue where you are contributing your content, and be prepared to play by their domains rules...just be sure you know exactly what they are.
I've turned comments off, if you have something to say about this post, good, bad or otherwise, write about it and link back here...Why? Its my content.