Please stop using Google.  When you search on Google, it records your IP address and search terms, and stores them in a database.  Google also scans your Gmail for keywords.  This information is used to build a personal profile of your activity, linked to your Google account.  Google then targets you with ads and search results based on the type of person it assumes you are.  Google will sell your ad profile to other companies so they can target you with their products.   Google is essentially a giant money-making panopticon, watching everybody and selling what they see.  All of the information they gather is available to law enforcement with a court order.

What’s the alternative?  Use the DuckDuckGo search engine!  This search engine does not record your User Agent, IP address, or search history.  Plus it automatically queries Wolfram Alpha and Wikipedia when you search.  Follow these instructions to make DuckDuckGo your default search engine when you type something into your URL bar.  Set the value to; https://duckduckgo.com/?q=

To further protect yourself online;

Install Do Not Track Plus.  This browser add-on blocks websites ability to track your browsing activity on their site.  It shows you when a website is trying to track you, and which companies it sells that information to. 

Install AdBlock Plus.  This browser add-on blocks all banner ads, Google ads, and YouTube ads.  It makes browsing the internet a pleasant experience, without the constant intrusion of disgusting advertisements into your consciousness. 

Install HTTPS Everywhere (Firefox only).  When you browse a website that uses a limited HTTP Secure protocol, HTTPS everywhere expands the security to the entire site.  This makes you much less vulnerable to attacks or traffic analysis.

Delete your Facebook account, or at least do not browse when logged into Facebook.  When you give your personal info to Facebook, it becomes their property.  Same with every photo you upload.  If you’re browsing when logged into Facebook, information about what websites you visit is added to the advertisement profile attached to your Facebook account.  And just like Google, Facebook sells this ad profile, all your information is available to law enforcement.  Oh, and Facebook will keep your personal information after you delete it, just because they can.  If you want to know what information Facebook holds on you, you can request an archive of it here.

Also; Here is a list of more anti-tracking software.