"Your Jetpack is almost ready!"

Jetpack and Akismet are installed by default by many hosting providers. In short, Jetpack gives you a ton of great features, and Akismet is a great anti-spam plugin.

You can read more about them at http://jetpack.me/ and http://akismet.com/

Jetpack provides both Twitter and Facebook connectivity (amongst many other features).

There are a lot of SEO plugins available: http://wordpress.org/plugins/tags/seo

http://wordpress.org/plugins/wordpress-seo/ and http://wordpress.org/plugins/all-in-one-seo-pack/ are the two most used SEO plugins.

Since you’re just getting started with WordPress, head on over to http://codex.wordpress.org/New_To_WordPress_-_Where_to_Start and https://codex.wordpress.org/First_Steps_With_WordPress

Should I deactivate it?

It’s up to you. A plugin choice is kind of a personal thing, just choose the one that seems right to you. 🙂

Can you check my website and make a review how is it going or what to do to make it better.

Sure, but it would be better to post in this section, so others can too: http://wordpress.org/support/forum/your-wordpress#postform