Here you will find ways that will help you get more referrals :
1. Create a Blog or Website to promote your PTC/Referrals Program Sites.  
This is the most effective way to get more referrals.
Once you start a blog or website start writing posts about the Referrals Program Sites for which you need referrals and put your banner and links.
The important things that you must learn about SEO to optimize your Blog or Website. You can search in Google about how to make your blog SEO or how to make your blog appear in Search Engine with your target keyword, so people will come to your site and register for your affiliate links automatically.

2. Downline Builder
A downline builder is a site that allow you to promote multiple PTC sites,Traffic Exchange sites, or other your affiliate programs in one site. It's the perfect solution for people who don't have a blog or website.
You simply enter your affiliate ID's into the site and then whenever someone clicks one of the links they join under you.

There are two type of downline builder :
A. PTC Downline Builder :
You have to join this site, so you can have more referrals in many PTC sites only by promoting one single link.
You don't need to click ads manually if you have already add the PTC plugins in Multiclicker/ClickersMulticlicker.
Here are the best PTC Downline Builder: PTC Professor

 

 There're 10 of the top PTC sites here. If someone join PTC Professor with your link, they will become your referrals from that 10 PTC sites.

B.Traffic Exchange Downline Builder :  
Here is the best TE Downline Builder:
1. DownlineTrafficBuilder

 

 It supported 10 best traffic exchange sites. With this software you can promote 10 best traffic exchange sites with just one single link.
Tutorial how to add Traffic  Exchanges to this DownlineTrafficBuilder, please go to Traffic Exchange menu, click Traffic Browser, go to Step 6.

2.FreeTECredits 

FreeTECredits is a Downline Builder of the best TE's  and it gives free credits  by doing something like surfing.  
3. Referrals Exchange Site
In this site you earn credits by viewing ads or joining a program, after that you can spend this credits on getting direct referrals to your own PTC sites.
Register getref.com here

4. Traffic Exchange  
Traffic Exchanges are websites that you surf other site to earn credits. Then you can use your credits to advertise your website.
You need to watch other sites for 1 - 2 hours per day if you want to gather enough credits to advertise your website for a long time.

It's important on getting more referrals in all these traffic exchange sites so you will get way more credits and don't have to surf all day on your own.

There is software that we can surf multiple traffic exchange sites faster.
The free software is Traffic Browser, it will help you to save time and earn credits faster.

With this software you can :
-  Auto Logging into your selected Traffic Exchanges.
-  Switching Tabs automatically after you have clicked the image vertification to receive credits.
-  Surfing multiple TE's in 1 browser.
-  Setting up groups of the best Traffic Exchanges.
-  Blocking Popups andother usefull features.

Here is step by step on how you can download Traffic Browser Software.

5. Social Media
Promote your site to social media like facebook,twitter,or google +.
Create a facebook page about your site and encourage people to like and share your page.
Regulary update your page to get people know about your page. 
This method is very powerful and has the ability to continuously bring new direct referrals for you for a very long time.

6. Active in Forums  
Join forum sites about making money where you can meet new people gather in search of money. So if you can attract other user to your site, you can get referrals easily.
Here is a list of popular ptc forums that you can join:
dreamteammoney.com
moneymakergroup.com
thebot.net
talkgold.com
talkptc.com

7. Advertise your PTC referral links in other PTC sites.