No harm in using meta keyword tag from Google's point of view. There are other search engines apart from Google who still consider meta tag signal in ranking. **Google is not only the traffic source.  **

You must solve these warnings. So here I'm gonna tell you how to do it. I removed hfeed and hentry from my template. To do this go to design section of blogger.com  of your blog. Click on edit HTML. Download and save your copy of template for backup.  If any thing goes wrong we will need this to fix things up. Now search for hfeed in the template. You will get it two times. It will be something like this

just remove hfeed. You will now have something like.
Next search for hentry. You will getand. Remove hentry from both so that you getand.
Now save the template.I have done so with my blog and now my articles featuring in Google Search results shows up my thumbnail and link to my profile.

Hi
This code will help you for aggregating the star ratings to make an average rating rich snippet. 

The following code represents an aggregated review of L'Amourita Pizza.

L’Amourita Pizza
9 out of 10, based on 24 ratings.
5 user reviews.

**Second one is this**

Mediterranean Wraps

Customers flock to this small restaurant for their
tasty falafel and shawerma wraps and welcoming staff.
4.5 out of 5
based on 17 reviews

<code>// build average ratings html
$average_rating = 'Average Rating: ';</code>

Hi,

You have blocked their IPs but it is not a perfect solution because blocking site in your servers can stop generating back links data. Google gets your links form that adult site. so try to contact the administrator  of that site for removing your link.  For that you can get contact details from Whois.com and send request mail that site for removing your link.

If you get unnatural link mail from Google about this site then you can put website's name in reconsideration request so that website is no longer in Google index, Google has removed that website from search and its also not showing in your  GWT backlinks profile.

Hi,

Link exchange sounds great but according to me Google LOVES the inbound links not reciprocated links. Link Exchange is a good if  the site linking to you has relevancy and provide DoFollow link . It would be even better to purchase advertising space from other sites in your niche that has high page rank and traffic so, you get traffic to your site without sending traffic away from your site.