Note: The 'Recommendations' product is in a closed Beta at the moment. If you wish to gain access, please contact your account manager.
Are some card types irrelevant to you? Then you can switch them off in your Preferences so you won't get them on your timeline anymore. You can change this back at any time, and see historic cards that were initially hidden.
To change your preferences, click on the 'Preferences' button as shown below:
By default, all cards are switched on. Click on a category (e.g. 'Prospecting') to view the cards that are part of this category. Then remove the tick box if you wish to disable this particular card from showing up on your Recommendations page.