Widdgets and backlinks can effect my position on SERP?

SERP stands for search engine results page.  It is the listing of results returned by in response to a query.  There are several factors which may affect your ranking on the SERP, some of them are counter-intuitive.  Google pandas and penguins are not as cute and cuddly as they sound.

Google Panda is an algorithm that ranks high content sites higher than high advertising sites and moves sites with little content lower on the SERP.  Google Penguin decreases the ranking in sites that "Spamdex" or contain duplicate content, or linking schemes.  So to just copy & paste your content will hurt your results.  Original content results in the highest rankings. 

Sometimes you may be hurting your ranking without knowledge   Adding a widget to your page which helps the client calculate a home value estimate may sound useful.  If it comes from Zillow, you are providing them a backlink and reducing your score in SERP.  Not so much that you are reducing your score, but you are inflating Zillow's score resulting in a potential lower score for your site.  Many free widgets provide backlinks to originating sites, most target both nationally and the same selling area that you do.  Everyone who uses their "Free" widget inflates the score nationally and regionally on SERP.

Have a consultation with your techie, you may be inadvertently affecting your SEO (search engine optimization) by using those free widgets.