While most would argue social media has had some impact on their relationships, 24-year-old Leonie Sii can pinpoint the exact Tweet that completely altered the direction of her life.

Sitting in her room after another night of no sleep in 2012, the Sydney teenager stumbled across a tutorial for a game which had her laughing during what she describes as 'a dark time' in her life, and she felt the need to thank the creator.

After finding the Swedish creator of the clip, Mattias Holmbom, on Twitter, she wrote to him to say: 'You sir, are amazing'.

Since their fateful meeting, the pair, now a couple, have travelled Europe together, lived overseas and now reside together in Sydney.

Fate: Leonie Sii (left) and Mattias Holmbom (right) met after the Swede replied to a tweet Leonie sent to him in the dead of the night

Mattias and Leonie had been speaking online for nine months before the then-19-year-old bit the bullet and decided to come and meet his sweetheart.

'My dad was very supportive, he actually paid for the ticket,' Mattias told Daily Mail Australia.

'I had a wonderful month here in Sydney.'

The tweet: The pair 'haven't stopped talking since' and nine months later Mattias flew to Australia to meet her

Seeing the sights: A few months later, Leonie moved to nearby Switzerland to fulfill the overseas portion of her international studies degree

Soon after, Leonie needed to spend a year abroad to meet the requirements of her international studies degree, and chose to spend it in Switzerland.

The couple met up often over the course of the year, and went on 'non stop adventures', which left them both certain they'd found a sure thing in each other.

'I really wanted to go to Norway and explore, so we booked a cruise for a week,' Leonie said.

'It was a dream come true, and it was great to be able to spend it with someone who was equally as excited.'

Here there and everywhere! The couple visited 15 countries in Europe during the year, and found excitement in every one

Supportive: The pair are still very much in love, and Leonie has built a following from blogging about their relationship among other things

Laughing together, they both recalled the moment the 24-year-old arrived in the country she was 'obsessed' with.

'She was crying on the floor,' exclaimed Mattias.

According to the 23-year-old, the couple rarely failed to find something new and exciting to do with each other and their year of travel 'laid the foundation' for their blossoming relationship.

Leonie told Contiki the couple had visited 15 countries over the 12 months, most of them chosen 'on a whim'.

'We went to Denmark without a plan, discovered beautiful nature we didn’t even know existed, hiked through Switzerland and just explored the world together,' she said.

On a whim: Leonie revealed most of their European adventures were completely spontaneous

'Non-stop adventures': The couple did not stop travelling, and think it laid a solid foundation for their relationship

Now both living in Sydney and working, Leonie as a blogger and Mattias editing videos and producing content for the social media channels of companies, their opportunities to travel are less - but they still find a way.

'We value going new places, and something you realise after travelling is everywhere in the world is worth going to,' the Swede explained.

'Even though we’re stuck in one place, and we only have a day or two on the weekends to go somewhere, there are a lot of places to go to and a lot of things to do, so we’ve kept the excitement going – even though it is a completely different phase of our lives.'

Home: Leonie and Mattias now live together in Sydney, and cope with the trials of everyday life by making the most of their weekends

For the couple, who are now the literal poster couple for how travelling can change your life, it has been a whirlwind - in the best way.

'We came from different parts of the world, and we’d sort of been hiding in our own little dungeons in our own rooms,' Mattias explained of their life before the fateful tweet.

'Since we found each other, we’ve been going everywhere in the world and it brought us both a new perspective on what life is.'