I think the conventional copyrights for non-fiction books are discouraging people from spreading your book.
For example:
No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, without the prior written permission of the author. To obtain permission to use materials from this book, please ... etc
What copyright do you use? How to encourage people to write about your book in their blogs and social accounts?
I'm not sure what you mean.
Encouraging readers to share the full text of the book? Or letting them quote substantial portions for review purposes or commentary?
If the former, you can use a Creative Commons license. If you mean quoting, not many readers take the time to write long book reviews or analysis. It's rare even among bloggers.
Yes, I meant it.
A book review would be great, but I agree that this rarely happens. Therefore, I do not want people to be afraid to share small pieces of the book on social networks. For example a screenshot. In order not to interfere with the spread of the book by word of mouth.
Creative Commons license looks like a great option. Thanks!