pic via ehow

1. Show up. mere exposure effect

2. Join a group.

3. Form a group.

4. Say nice things about other people.

5. Set a target.

6. Make an effort to smile.

7. Make friends with friends-of-friends.

via huffingtonpost

1. Invite your colleagues for a drink at the end of your probation period, and bring them a taste from your country

2. Play football (or any other game) after work

To know locals:

3. Learn the language and the local expressions. It helps to understand the local way of thinking.

4. Ask cultural-oriented questions. Compare with your culture, and learn to appreciate the difference. 

5. Be open minded to a different humour. You may not understand at the beginning,  you'll appreciate with time

6. Present yourself to your neighbors

If you have kids:

7. Gary's n°5 is perfect

If you're young, with not that much money:

8. Find a flatshare

In general:

9. Find yourself activities: participate to associations, play music in a band, practise sport ...

10. Go out as much as you can!

via expat-blog

1. Non-Judgmental
2. Compassion
3. Listening
4. Trust:
5. Encouraging
6. Respect
7. Fearless:
8. Unconditional love and friendship

via entertainmates

1. Spend more time around people.
2. Always try and talk about stuff that they like and more about them.
3. Talk to people.
4. Introduce yourself
5. Initiate a get-together.
6. Be a good friend.  
7. Choose your friends wisely.
8. Genuinely start listening to your friends.
9. Make sure you always make time for every friend you have.
10. Buy An Above Ground Swimming Pool.

via wikihow

1. Listen and Ask Questions

2. Give a Compliment

3. Detach Yourself From Technology -- Temporarily

4. Join a Club or Team

5. Volunteer

6. Get a Job

7. Form a Study Group

8. Laugh

via about.com

1. Stop by. Pop in. Hang out. Show up. Make an effort.
2. Become a regular.
3. Remember names.
4. Convey confidence and know that you are worthy of friendship.
5. If you don’t have anything nice to say, bite your tongue.

via ehow