<｜begin▁of▁sentence｜>### Instruction:
Imagine we're planning a viral social media campaign for a new lifestyle app designed to connect people in the most efficient way possible. Our map of potential user connections is sketched out as follows: pairs of users ready to interact are (1 & 2), (1 & 3), (1 & 4), (3 & 4), (3 & 5), and (4 & 5).

For the ultimate reach and impact, I want to identify the influencer in this network who is pivotal for spreading our campaign like wildfire. This would be someone positioned in such a way that they can traverse to any other user in the shortest number of steps - a kind of social nexus if you will. Can we leverage NetworkX to spot this central figure, the one who stands at the 'heart' of our graph, by finding which user (or users) has the minimal connection distance to all others? Remember, this is not just about popularity, but strategic placement in the network topology.
### Response:
import networkx as nx

# Create a graph
G = nx.Graph()
G.add_edges_from([(1, 2), (1, 3), (1, 4), (3, 4), (3, 5), (4, 5)])

# Calculate the center of the graph
graph_center = nx.center(G)

print('Center of the graph:', graph_center)
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